diff --git a/container/gtree/gtree.go b/container/gtree/gtree.go
index fdb1e9132..56f69268d 100644
--- a/container/gtree/gtree.go
+++ b/container/gtree/gtree.go
@@ -5,4 +5,7 @@
 // You can obtain one at https://github.com/gogf/gf.
 
 // Package gtree provides concurrent-safe/unsafe tree containers.
+//
+// Some implements are from: https://github.com/emirpasic/gods
+// Thanks!
 package gtree